To sign God, swipe your dominant hand in front of your head, your thumb touching your forehead, then pulling downward to your chest area. It's like one half of two praying hands. Alternatively, just doing the first part - touching the thumb of a flat open hand to the forehead, is enough to sign God in ASL.
We use the sign for God to introduce our baby to religious topics.
Use the god flash card in conjunction with other religious or mythological concepts to help your babies become familiar with abstract concepts.